MCQ
The silicates which contain $Si_2O_7^{-6}$ units are called
- ACyclic silicates
- BChain silicates
- ✓Pyro silicates
- DOrtho silicates

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| $LIST-I$ $(Substances)$ | $LIST-II$ $(Element Present)$ |
| $A$. Ziegler catalyst | $I$. Rhodium |
| $B$. Blood pigment | $II$. Cobalt |
| $C$ .Wilkinson catalyst | $III$. Iron |
| $D$. Vitamin $\mathrm{B}_{12}$ | $IV$. Titanium |
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